Expanding mandrel



July 18, 1933. H. R. CRANE EXPANDING MANDREL Filed Aug. 18, 1931 INVENTOR) fl/R 67%?! A TTORNEY Patented July 18,1933 i HUBERrR. CRANE, ormos an ennas, caL FonNIA, assie von oriom -sixrn ro onnv f.

J. BUCKLEY, ONE-SIXTH TO. EARL nu M-CKEEN, Annonnsrxrn mourning HAYNEsALL or LOS ANGELEVS,P7CALT FORNIA EXPANDING MAINDREL I Application filed August 18;, 1931. Serial No. 557354.

This invention relates to inechanics' tools and more especially to a tool in the nature. of an expanding mandrel, and whose ex-- :panding action is accomplished upon relarelative axial action of parts as is common in many forms of expansion mandrels.

Anobject is to provide a tool,incorporat inga stock body providedwith an arbor hav' ing a cross-section of suchcontour. as to present a plurality of angular, longitudinal cor ners which are designed to co11nter5thrust against mutual bore angles in a set of eXpan-' ision parts. which, assembled, present one or) more peripheral, bitmg'surfaces of arb trary diameter, in' echelon.

" cludes astock body 2 of any desired cross-' Again," an object is to provide an expansion, bindingtool having'an expansion co1-' lar which may be instantly expanded by relative rotation of an internal arbor in either d1 rection. 1 p

And a further ob ect is toprovide a mandrelincludlng an expansion collar having capacity for internally engagine one or. another of objects having bores of diiierentdiameter and complementary to the collar sizesr .An additional object is to provide for the ready interchange of one or anotherof a supply of collars selective for use on given bore size objects or work pieces);

The invention consists of certain'advance, ments in this art as set forth in the ensuing disclosure and having, with the above, addi= I tional objects and advantages,: and whose construction, combination and details ofmeans, and manner ofoperation will be made manifest in the description of the herewith illustrative embodiment; it being understood that modifications, variations and adaptions' may be resorted to within the scope, principle and spirit of theinvention as'it isinore directly claimed hereinafter.

Figure'l is a sectional, elevation of the tool, indicatinga mode oi. use.

Figure 2 is a detailshowing a headed arbor. Figure 3 is an endview showing one form of arbor body.

Figures 4 and 5 forms. v e V V 'In the embodiments shown the tool insection and forming a handle or purchase bar to be rotated, asin a chuck O (dotted lines, Fig. 1). One end of this stock is provided with an arbor body 3 which may be of 7 show variant arbor body ized presentingsymmetrical pairs of dia metrically opposite angle shoulders twhich v V ex'tend longitudinally ofthe arbor 3. tive rotation of certain parts without any' In Fig. 3; thearbor 3 is shown asof' cylin-l triangle-section arbor.

. In any of its forms, the arbor is "encomf f various cross-sectional shapes all character-ff passed by an expansiblecollar composed of a plurality of duplicate pieces 6-;6, which when aSSemblecL-present a bore which is com-1 plementary tothe arbor 3. I g

In use andoperation of the mandrel collar pieces 616 will instantly T expand {under j {the thrustof the shoulders I4 and theperiphoral face of the mandrel will bind onthebore The 'collar mayfi'have only one peripheral surface of a complementary work object 7 O.

' diameter as 7 {which is knurledat 8,'but pref erably the collar has echelon faces 7 of 'de-' sired diameter so that the one collarmay be used 'on' various boreesizeobjects, without q change of position and avoiding .change of I collar for'each siZe. The symmetrical shape and arrangement of the arbor. corners 4.l is;-. L

such that they act effectively upon rotation of the arbor in either direction. This is an im portant advantage in screwing and unscrew in'gp'arts.

. If'desired the arbor 3 may havea shoulder l v or head 3' to retain the collarjagainst end shift. Preferably the collar pieces a'reloose- 1y retained by asp ring yoke 10 i i gan a II groovell in the collar PtLIftSQbHlLI1Ql3, COI1f;.:

tracting them tight onto the arbor.

What is claimed is: i

t a vtojoloithe class described, alstockf shank having elongated, longitudinal, paral-lel-angle shoulders'parallel to and equidisftant from the axis o'f'the shank, and jan' elongated, SpIitcOIlarJ-fbrmed of jdupli'cat'e segments each. of whichhas peripheral portions V of varioussdiameters along its length, and)" each portionihaving external tjeethfor biting in a borejwall; said segments forming substantiallycomplete cylinders and'ioperatively" v fitting said shankinleither of reversedposi J .tlQIlS thereon, and-said shoulders operative 9 to thrustthe segments radially according to the direction offshankfrotation and enable biting effect of the teeth on rotation of; the

collar in. either: direction by the shank;

' HUBERT CRANE. 

